why does my onTouched cause my other code to stop working?

I am attempting to make a car anti-theft so people cant steal it. I have to use a onTouched to make it work but it messes up other code parented into the seat

heres the code:

local seat = script.Parent

local car = seat.Parent

local carowner = seat.CarOwner



function onTouched(part)

if part.Name == "Left Leg" then

local h = part.Parent:FindFirstChild("Humanoid")

if (h ~= nil) then

carowner.Value = h.Parent.Name

end

end

end





script.Parent.Touched:connect(onTouched)